Question

Two statements are given below: Statement I: The boiling points of alcohols increase with increase of branching in carbon chain.
Statement II: The solubility of alcohol decreases with increase in size of alkyl group.

• A. Both statements I and II are correct.
• B. Both statements I and II are not correct.
• C. Statement I is correct but statement II is not correct.
• D. Statement I is not correct but statement II is correct. \

Hint:

When determining the solubility of alcohols in water, remember that smaller alkyl groups (such as methyl or ethyl) are more soluble due to their smaller hydrophobic interactions. Larger alkyl groups reduce solubility as they increase the nonpolar character of the molecule.

Answer 1

The Correct Option is D

Statement I: The boiling points of alcohols generally increase with an increase in the size of the carbon chain, but with branching, the boiling point tends to decrease because the surface area for van der Waals forces decreases. Hence, Statement I is incorrect. Statement II: As the size of the alkyl group increases, the solubility of alcohol decreases due to the increasing hydrophobic character of the alkyl group. This makes alcohols less soluble in water. Hence, Statement II is correct. Thus, the correct answer is option (4), Statement I is not correct but statement II is correct.